Most developing-nation currencies declined as Poland said the risk of Russia invading Ukraine has increased in the “last dozen hours or so” after President Vladimir Putin raised the number of troops on his country’s western border.

Brazil’s real gained the most in a month after the central bank stepped up efforts to arrest the world’s worst currency decline, announcing a $60 billion intervention program involving currency swaps and loans.

The real dropped to a four-year low as U.S. Federal Reserve minutes signaled broad support for a plan to curtail a stimulus program, prompting Brazil’s central bank to intervene in the currency market.